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To strike a loud, nagging crone with the back of the hand in order to stop her cruel laughter.

A term in use for a undetermined time in English , but with roots in 17th century french.
The cuckolded husband found his evil harpy of a wife in bed with his brother. Her cackling at his pain and shame was to much for him to bare; he witch slapped her into unconsciousness.
by The Iron Duke. February 17, 2010
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